Beam management for a device in an inactive mode

Abstract

Example embodiments of the present disclosure relate to transmit power control for beam management. The first device transmits a first configuration to a second device. The first configuration indicates information about at least one candidate beam assigned to the second device. Alternatively, or in addition, the first configuration further indicates a correspondence between the at least one candidate beam and a plurality of transmission occasions, where the plurality of transmission occasions are allocated by the first device for transmission from the second device to the first device while the second device is in an inactive mode. The first device detects transmissions from the second device according to the first configuration at the plurality of transmission occasions. Through this solution, a beam management solution and efficient resource configuration for a device in an inactive mode is proposed.

What is claimed is: 
     
         1 . A first device comprising:
 at least one processor; and   at least one memory including computer program code;   wherein the at least one memory and the computer program code are configured to, with the at least one processor, cause the first device to:   transmit, to a second device, a message indicating an allocation of pre-configured physical uplink shared channel (PUSCH) resources in accordance with a configured grant-based scheme, the PUSCH resources allocated by the first device for transmission from the second device to the first device while the second device is in an inactive mode;   transmit, to the second device, a first configuration indicating:
 information about candidate beams assigned to the second device, and 
 a correspondence between the candidate beams and a plurality of transmission occasions of the pre-configured PUSCH resources; and 
   detect, at one of the plurality of transmission occasions that corresponds to more than one candidate beam, a transmission from the second device according to the first configuration and an indication of a target beam which is determined by the second device from the more than one candidate beam.   
     
     
         2 . The first device of  claim 1 , wherein the correspondence between the candidate beams and a plurality of transmission occasions indicates that
 different candidate beams are corresponding to different subsets of the plurality of transmission occasions.   
     
     
         3 . The first device of  claim 1 , wherein the transmission occasions are periodic resources; and
 wherein the first configuration further indicates respective periodicity of the candidate beams.   
     
     
         4 . The first device of  claim 1 , wherein a first candidate beam of the candidate beams is configured with a first periodicity, and a second candidate beam of the candidate beams is configured with a different second periodicity. 
     
     
         5 . The first device of  claim 1 , wherein the first configuration is transmitted within a radio resource control (RRC) message instructing the second device to enter into the inactive mode, and the inactive mode is an RRC inactive mode. 
     
     
         6 . The first device of  claim 1 , wherein the first configuration indicates respective indexes of the candidate beams assigned to the second device. 
     
     
         7 . A second device comprising:
 at least one processor; and   at least one memory including computer program code;   wherein the at least one memory and the computer program code are configured to, with the at least one processor, cause the second device to:   receive, from a first device, a message indicating an allocation of pre-configured physical uplink shared channel (PUSCH) resources in accordance with a configured grant-based scheme, the PUSCH resources allocated by the first device for transmission from the second device to the first device while the second device is in an inactive mode;   receive, from the first device, a first configuration indicating:
 information about candidate beams assigned to the second device, and 
 a correspondence between the candidate beams and a plurality of transmission occasions of the pre-configured PUSCH resources; and 
   in accordance with a determination that the second device is in the inactive mode and there is transmission to be transmitted from the second device to the first device:
 determine a target transmission occasion from the transmission occasions according to the first configuration, the target transmission occasion corresponding to more than one candidate beam; 
 perform, at the target transmission occasion, the transmission from the second device to the first device; and 
 transmit at the target transmission occasion an indication of a target beam selected from the more than one candidate beam. 
   
     
     
         8 . The second device of  claim 7 , wherein the correspondence between the candidate beams and a plurality of transmission occasions indicates that
 different candidate beams are corresponding to different subsets of the plurality of transmission occasions.   
     
     
         9 . The second device of  claim 7 , wherein the transmission occasions are periodic resources; and
 wherein the first configuration further indicates respective periodicity of the candidate beams.   
     
     
         10 . The second device of  claim 9 , wherein a first candidate beam of the candidate beams is configured with a first periodicity, and a second candidate beam of the candidate beams is configured with a different second periodicity. 
     
     
         11 . The second device of  claim 7 , wherein the at least one memory and the computer program code are configured to, with the at least one processor, further cause the second device to determine the target transmission occasion by:
 determining the target transmission occasion based on at least one of the following:
 received signal strength of the candidate beams, or 
 time differences between the current time point and transmission time points corresponding to the transmission occasions. 
   
     
     
         12 . The second device of  claim 7 , wherein the at least one memory and the computer program code are configured to, with the at least one processor, further cause the second device to determine the target transmission occasion by:
 determining one of the following as the target transmission occasion:
 a transmission occasion corresponding to a candidate beam of the candidate beams with the best received signal strength, or 
 a next transmission occasion corresponding to a candidate beam of the candidate beams that supports an acceptable transmission from the second device to the first device. 
   
     
     
         13 . The second device of  claim 7 , wherein the at least one memory and the computer program code are configured to, with the at least one processor, further cause the second device to perform a subsequent transmission using a transmission occasion corresponding to the target beam. 
     
     
         14 . The second device of  claim 7 , wherein the first configuration is transmitted within a radio resource control, RRC, message instructing the second device to enter into the inactive mode, and the inactive mode is a RRC inactive mode. 
     
     
         15 . The second device of  claim 7 , wherein the first configuration indicates respective indexes of the candidate beams assigned to the second device. 
     
     
         16 . The second device of  claim 7 , wherein the determining the target transmission occasion is based on the selected target beam. 
     
     
         17 . A method, comprising:
 transmitting, at a first device and to a second device, a message indicating an allocation of pre-configured physical uplink shared channel (PUSCH) resources in accordance with a configured grant-based scheme, the PUSCH resources allocated by the first device for transmission from the second device to the first device while the second device is in an inactive mode;   transmitting, at the first device and to the second device, a first configuration indicating:
 information about candidate beams assigned to the second device, and 
 a correspondence between the candidate beams and a plurality of transmission occasions of the pre-configured PUSCH resources; and 
   detecting, at one of the plurality of transmission occasions that corresponds to more than one candidate beam, a transmission from the second device according to the first configuration and an indication of a target beam which is determined by the second device from the more than one candidate beam.   
     
     
         18 . The method of  claim 17 , wherein the correspondence between the candidate beams and the plurality of transmission occasions indicates that
 different candidate beams are corresponding to different subsets of the plurality of transmission occasions.   
     
     
         19 . A method, comprising:
 receiving, at a second device and from a first device, a message indicating an allocation of pre-configured physical uplink shared channel (PUSCH) resources in accordance with a configured grant-based scheme, the PUSCH resources allocated by the first device for transmission from the second device to the first device while the second device is in an inactive mode;   receiving, at the second device and from the first device, a first configuration indicating:
 information about candidate beams assigned to the second device, and 
 a correspondence between the candidate beams and a plurality of transmission occasions of the pre-configured PUSCH resources; and 
   in accordance with a determination that the second device is in the inactive mode and there is transmission to be transmitted from the second device to the first device:
 determining a target transmission occasion from the transmission occasions according to the first configuration, the target transmission occasion corresponding to more than one candidate beam; 
 performing, at the target transmission occasion, the transmission from the second device to the first device; and 
 transmitting at the target transmission occasion an indication of a target beam selected from the more than one candidate beam. 
   
     
     
         20 . The method of  claim 19 , wherein the correspondence between the candidate beams and a plurality of transmission occasions indicates that
 different candidate beams are corresponding to different subsets of the plurality of transmission occasions.